Hello,
today I noticed, that when I measure 1kV with the U1272a DMM in Low Z mode, the DMM gets a bit warm on a certain area of the surface (42°C / 108°F).
This Area is exactly where the PTCs are mounted on the PCB. What is the P/N of that PTCs which are used for that function?
There are four PTCs; I presume they are connected in series?
I hope I don't overdrive them with 1kV?
You can see the PTCs on daves Video (Dave is pointing at them); unfortunately they are heatshrinked.
BTW: The PTCs are drawing 1mA when 1kV is applied